I am Murloc, a thrash metal tribute to the race of fish people, set for release today.

Guitar Hero III: Legends of Rock screenshot

Activision and Blizzard have announced a collaboration between two of the companies' biggest properties, World of Warcraft and Guitar Hero.

Today a free downloadable Guitar Hero III version of WoW hit "I am Murloc" will be made available for Xbox 360 and PS3 players in advance of the 2008 Blizzard Entertainment Worldwide Invitational.

"I am Murloc" is a tongue-in-cheek tribute to the beloved race of fish-people by Blizzard Entertainment's house band, Level 70 Elite Tauren Chieftain. The trash-metal song was debuted at BlizzCon 2005.